Results 101 to 110 of about 688 (138)

A distributed micro sonar network for marine mammal monitoring.

The Journal of the Acoustical Society of America, 2010
The design of a distributed micro sonar network (DMSN) is presented. The DMSN is a miniaturized, low-power, and high-frequency version of the swimmer detection sonar network used to detect and track marine mammals at ranges out to 500 m. The intent is to use it for monitoring during potentially harmful military and commercial activities such as high ...
Nicholas A. Rotker, Peter J. Stein, Patrick Edson, John Wood   +3 more
openaire   +1 more source

Naval sonar, marine mammal strandings, and the bubble hypothesis

The Journal of the Acoustical Society of America, 2006
Although spatio–temporal links exist between some military active sonar testing and cetacean mass stranding events, the underlying causal mechanism(s) of the strandings are not well understood. It has been demonstrated that cetaceans may experience in vivo gas bubble/emboli development; however, the basis for cavitation formation remains unknown ...
Mark W. Muller, Whitlow W. L. Au, John S. Allen, Eryn M. Wezensky, Michael R. Barkley   +4 more
openaire   +1 more source

An acoustic finite-element model to study sonar interactions with marine mammals

The Journal of the Acoustical Society of America, 2008
A computer model based on the finite-element method (FEM) is being developed to study the interaction of sonar signals with marine mammals. This model solves the Helmholtz equation in a computational box that includes the animal and the surrounding medium, water.
Gonzalo Feijoo, Kenneth Foote
openaire   +1 more source

High frequency marine mammal mitigation active sonar system

MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295), 2002
The High Frequency Marine Mammal Mitigation (HF/M3) sonar system was specifically designed to meet the marine mammal mitigation plan proposed by the Surveillance Towed Array Sensor System Low Frequency Active (SURTASS LFA) Draft Environmental Impact Statement.
P. Stein, J. Rudzinsky, M. Binnam, W. Ellison, J. Johnson   +4 more
openaire   +1 more source

Marine Mammal Active Sonar Test 2004 (MAST 2004)

The Journal of the Acoustical Society of America, 2004
The Marine Mammal Active Sonar Test was conducted in January 2004 off the central California coast during the gray whale migration. The purpose of the test was to collect data to significantly advance active sonar detection, classification, and tracking of marine mammals out to ranges of 1 mile. The R/V New Horizon was moored in the migration path. Two
Peter J. Stein, Amy Vandiver, Geoffrey S. Edelson, Adam S. Frankel, Christopher W. Clark   +4 more
openaire   +1 more source

The role of passive sonar technology in marine mammal population assessment

The Journal of the Acoustical Society of America, 1994
When sonar detection of marine organisms is mentioned most every one visualizes active sonars. This is because development of passive sonar systems has been essentially limited to military use until recently. With the development of new designs, submarines could run deeper and more silent than in the past.
William E. Evans, Robert Benson
openaire   +1 more source

An approach to maximum likelihood identification of autoregressive marine mammal sources by passive sonar

IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004, 2004
1438
Eduardo Hernández-Pérez, Juan L. Navarro-Mesa, María J. Millan-Muñoz   +2 more
openaire   +2 more sources

Marine mammal echolocation provides a model of forthcoming bio-oriented sonar

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600), 2005
Cetacean's sonar is an appropriate model of underwater acoustical sensing technology. Sonar behavior of three free-ranging finless porpoises in an oxbow of the Yangtze River was observed by microdata logger systems attached on the animals. Newly developed acoustic data logger could record porpoise's sonar pulse events 1000 times every second with the ...
T. Akamatsu, null Ding Wang, null Kexiong Wang   +2 more
openaire   +1 more source

Modeling Effectiveness of Gradual Increases in Source Level to Mitigate Effects of Sonar on Marine Mammals

Conservation Biology, 2013
Abstract Ramp‐up or soft‐start procedures (i.e., gradual increase in the source level) are used to mitigate the effect of sonar sound on marine mammals, although no one to date has tested whether ramp‐up procedures are effective at reducing the effect of sound on marine mammals.
Benda-Beckmann, A.M. von, Wensveen, P.J., Kvadsheim, P.H., Lam, F.P.A., Miller, P.J.O., Tyack, P.L., Ainslie, M.A.   +6 more
openaire   +3 more sources

Modeling backscatter of marine mammal biomimetic sonar signals from bubble clouds

OCEANS'10 IEEE SYDNEY, 2010
Bubbles are powerful and complex sound scatterers in water because of the impedance mismatch at each water-air/gas interface. Bubbles are formed by natural processes that include rainfall, gas emission from the sea bed, boat wakes, living or decomposing organisms, and wave breaking- the latter being the dominant cause of bubble entrainment in the surf ...
K. P. Yeo, Elizabeth Taylor, S. H. Ong
openaire   +1 more source